Share-based payments (Details 1)	9 Months Ended
	Sep. 30, 2020 USD ($) $ / shares shares
Share-based payments
Shares Outstanding, Beginning	9,735,836
Granted
Forfeited or expired	(3,319,333)
Shares Outstanding, Ending	6,416,503
Shares Exercised	6,416,503
Beginning balance | $ / shares	$ 0.36
Ending balance | $ / shares	0.08
Exercisable | $ / shares	$ 0.08
Beginning balance	1 year 3 months 18 days
Ending balance	1 year 1 month 6 days
Exercisable, Ending	1 year 1 month 6 days
Beginning balance | $	$ 2,000
Ending balance | $	20,750
Exercisable | $	$ 20,750